Metal reenforcement for structural reenforced concrete members



Aug. 16, 1932- B. DUCHSCHER EMENT FOR STRUCT ENFORG 2 Sheets-Sheet 1 Filed Oct. 24, 1929 g- 16, 1932- B DUCHSCHER 1,871,594

METAL REENFORCEMENT FOR STRUCTURAL REENFORCED CONCRETE MEMBERS Filed 001;. 24, 1929 2 Sheets-Sheet 2 NTO R w E 4' Q ATTORNEY Patented Aug. 16, 1932 V BERNARDDUCHSCHER, OF CLEVELAND-,fOHIO METAL nnnnroncemnnr roe srnucmunar. n-nnnrononn coucnnrn MEMBERS.

Application filed October 24,1929. serial Nu. 4o2,241

My invention relates to improvements in metal reenforcements for concrete supports, more particularly to reenfor-cements for concrete supports used in constructions, and it consists in the combinations, constructions and arrangements herein described and claimed. 1

An object of my invention is to provide a metal reenforcement that is especially suitable for reenforced concrete l'oad-carriersrequiring great resisting moments, as well as great resisting shears of force in their design. 7 A further object of my invention is to provide a metal reenforcement for concrete that may be adapted to relieve the-concrete in which it is embedded of tensile, flexural and shearing stresses and strains with the use of a minimum amount of metal reenforcement.

' A further object of my invention is to pro vide a metal reenforcement portions of which may be positioned adjustably before the embedding process in the .moste-ifective Figure 1 lookingin the position for relieving the concrete of the various strains and stresses.

A further object of my invention is to design a metal reenforcement that may be extended to reenforce a concrete memberof any desired volume. r V V 1 V A further object of my invention is to provide a device of the type described which is simple in construction, has few parts and is not likely to get out oforder easily.

I Other objects and advantageswill appear in the following specification, and the novel features of the invention will'be particularly pointed out in the appended claims.

-" My invention is illustrated in the-accompanying drawings, forming a part of this applicatiomin which I Figure 1 is a top plan view of one form of my device assembled for use, H y

Figure 2 is a side elevational view of the same form of my device, a

Figure 3 is a sectional view on line 3'-3 of arrow,

looking in the direction of the arrow,

those'portions 6 thereof angle for a purpose which direction of the;

Figure 5 is a perspective detail view of a portion ofmy device, i V I 'Figure 6 is a sectional view-showing my device fitted to apply as 'a reenforcement to a concrete member of small volume, u Figure 7 is a plan view of another formof o my device, f r F igure 8 is an elevational' detail view of a portion ofmy device,

'Figure 9 is a sectional 99 of" Figure 7, l

Figure 10 is a sectional 'view on the line 10''l0 of'Figure 7", and Q i 1; Figure 11 is a perspective detail view ofta portion of my device. 5 In carrying out my-invention Imake use of metalbars, termed bulbbars, as shown'at 1. These bulb barscomprise a bulb-shaped perview on the line '6 tion shown at 2,1a reduced portion'as at 3 and lugs 4 positioned in paired relation along said reduced portions for the purpose of securing locking web members '5 thereto.

7 These web members 5 by being wedged at- 7 between the lugsp i and the bulb portions 2 of the bulblbars 1 are held in rigid position'relative thereto,'in securing which eifect the portions 6 of the webs 5 are bent slightly, as is readily seen from an examination of Figure 3. These webs fixedly position the bulb bars in paralgo 'lel relationrelative to one another and prevent lateral movement thereof. 'It is easily seen that this system of reenforcement could beextended to reenforce a concrete member of any extent by simply increasing the vnums5 her of bulb bars and providing a correspondingly extending web. As is also show n'in Figure 3 these webs 5 are provided-with elongated openings7, adapted to accommodate therein the concrete 'inwhich they are embedded; These webmembers are adapted to 1 bebent along "the dotted-line 11,-as shown in Figures 3 and 10, to any desired will presently appear,

For preventing longitudinal movement of the bulb bars, as well as for the securing of said bulb bars against lateralmovement, I

provide locking yokes 8 provided with down-' wardly extending flan'ge portions 9 and 10 I09 adapted to engage between the lugs 4 on the inside and the outside of said bulb bars respectively. These flanges 9 and 10 are fastened to the bulb bars by the insertion of any suitable expanding means in web shaped slots shown at 11.

From the foregoing description. of the various parts of the device the use, thereof, will be readily understood. This metal reenforcement is designed especiallyfor shal- 7 7 various diagonalsection of the .loadcarrying 7 that bytheuseof a desired numberof bulb concrete member. These web; plates-may also be spaced along thebars as desired for the accommodation of various stresses occurring at varijous points, p Q 5 The yokes, forthe securingyof mybulb bars against-,l'ateral movement, as well as against longitudinal movement, are placed upon the bulb bars andsuitably spread in locking .jrelation- ,It is j readily apparent barsand the extension of the webs and yol'res to accommodate said bulb bars as desired, Imay structurally reenforce-a concrete member of any size, although the use of a single '7 bulbbar unit and a double bulb bar unitpnly are shown in my drawings; The slots-7 in the web and the irregular formation ofthe bulbbars and yokes furnishexcellent means for engagingthe concretelin which the-structure is to be embedded. Figure 7 shows an adaptation of my device which is especially designed for deep beams, girders, arches, ribs and similar concrete structures. The ;bulb bars 12 are constructed exactly similar to; the bulb bars 1 with the exception that the upper and reduced portion areextended intovertical upstanding flanges? These upstanding flanges or stems are provided with oppositely disposed perforations 13 which in company with. the lugslon these bulb bars provide a continuous bond between said bars and. the

concrete embedding them, said bond being simultaneously, 7 a, frictional and mechanical bond. long stem bulb bar is designed to resist the deformation'of a reenforced concrete load-carrier not only by a horizontal tension but alsoby a flexural shear,jen- -tir ely--bearing the tensile, as welli as the shearing stresses and strainsintheconcrete embedding said bulb bar; .The -cross-sec-' ltional'area 2 of this bulb'vbar, is made of suflicient area to support its proportionate share of the largest tensile stresses while the perforated stem extending above the bulb portion is made ofsuiiicient sectional area to carry its proportion of the greatest shearing stresses as requiredin such load carriers, for which this long stem 1y Suited." a o p I ,1 This perforated stem extends into the compression area of the concrete member. As a iresult,-s'aid bar,' assists the concrete in supportingthe elastic action cf the load carrier in a manner similar to that obtained in homogenerous load carriers made of the same elastic material throughout. The web platesl i areconstructed similarly to web plates5 except that theyprovide longand short slots 15 and 16, while that portion 17 r of said webs maybe perforated or unperforated as the case requires, These websmay also'be bentsas in is to release the tensile, as well as the shearing stresses and; strains in the concrete portions comprised byithe bulb bars and also in thelbulbfbars and theprotective coats of concrete in thelload carrier; Y The yokes 18 are of a little different ,construction thanthe yokes 8 in that they are not, provided with flanges for engaging the outer portionof thebulb bare These yokes,

bulb bar is especialthecase of webs 5.- The purpose of these webs however suitably secure the bars in spaced parallel relation; 7 I v The use of this device is similar to that of the device consisting of the bulb bars which "do not-have the upstanding stem. The varirous parts'are' assembled as before, the webs be'ingbent to the desired angle and the elementsbeing constructed of the cross section desired. The perforations 13 and the lugs as in the former case provide excellent gripping 4 surfaces for engagement with the embedding concrete. The structure is formed and adapt ed to be positioned to bear the stresses and strains whichtend to flexurally shear and gension the load supportingv concrete memer. V I

Due to parts of my device. the elastic expansion and "contraction due to the-action of imposed loads and temperature changes islequalized in all sections of the load carriertso that the con- .crete embedding my .r'eenforcement, is re- .leased of the function "of equalizing-internal stresses and strains in the load carrier;

1. A metal reenforcement for concrete, comprising a plurality of bars adapted to relieve'the concrete of tensile and shearing stresses andstrains, means for securing said b'ars against transverse and longitudinal thelocking arrangement of allthe movement relative to one another and further -,means for securing said bars-in spaced parallel relatiomisaid securing means and said bars being formed with inter-engagingmeansfor variably positioning said securing means along the length of said bars.

2. A metal structure for reenforcing concrete comprising a plurality of bars for resisting the tensile and shearing stresses and strains and web means for securing said bars in spaced parallel relation and further resisting the tensile and shearing stresses and strains, said Web means being provided with openings adapted to extend into the compression portions of the concrete, whereby a strong bond is formed-between the webs and said concrete, and the expansion and contractions of the concrete due to temperature and'load changes is provided.

3. A metal reenforcement for concrete comprising a bar composed of a body portion having a reduced portion extending outward- 1y along one longitudinal edge thereof, and lugs projecting in paired relation fromopposite sides of the reduced portion defining in- 1 terlocking means for other reenforc-ing members.

4. A metal reenforcement for concrete comprising a bar composed of a body portion and a reduced portion extending-therefrom, spaced lugs projecting in opposed relation from the sides of the reduced portion and a web member having a slot for loose engagement upon the bar between the lugs and Y adapted for movement longitudinally of the par into interlocking engagement with said ugs. V

5. A metal reenforcement for concrete comprising a pair of bars each formed with a projecting reduced portion, spaced lugs extending from the reduced portions, and a locking yoke formed with flanges for engagement between the lugs to maintain the bars in spaced parallel relation.

6. A metal reenforcing structure for concrete comprising a pair of bars each formed at spaced points with oppositely extending lugs, a web member maintained in interlocking engagement with the bars by engagement with certain ofthe lugs and a locking yoke engaging the bars intermediate the lugs and maintaining the bars in spaced parallel relation.

BERNARD DUOHS CHER. 

